CVE-2026-35601CWE-93

Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output

Medium · published April 10, 2026

CVSS v3.1
4.1
EPSS
0%
Percentile
24.1
In the wild
Unconfirmed
What it is

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator builds iCalendar VTODO entries via raw string concatenation without applying RFC 5545 TEXT value escaping. User-controlled task titles containing CRLF characters break the iCalendar property boundary, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is fixed in 2.3.0.

The record
Technical detail
CVSS v3.1
4.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00323 · 24.1th percentile
Weakness
CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')
Published
2026-04-10T16:08Z
EPSS history
Timeline
  • 10 APR 16:08Z
    Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output
    cvelistv5